During last year’s trial, jurors at Birmingham Crown Court heard of the horrific abuse that Daniel suffered at the hands of Luczak and Krezolek, both Polish nationals.

Daniel was locked in a freezing cold room, starved, beaten, made to perform arduous punishment exercises and force-fed salt.

He weighed just one stone 9lbs when he died, two days after suffering a head injury.

During the 30-hour period in which he lay dying, Luczak and Krezolek chose not to call an ambulance, instead opting to carry on with their normal lives.

Passing sentence on the pair, Mrs Justice Cox said: “Harrowing details of the unimaginable acts of cruelty and brutality inflicted on little Daniel, over many months, have exposed both the torment and despair he must have suffered and your callous disregard for his pain and distress.

“He was subjected by both of you to deliberate, escalating and incomprehensible brutality, which continued right up to his death.

“For reasons which are unfathomable, Daniel became a target for derision, abuse and systematic cruelty, designed to cause him significant mental and physical suffering.

“The scale of his suffering was truly horrific.”

His death led to a serious case review after teachers at Little Heath Primary School and health professionals failed to raise the alarm, along with calls for Daniel Pelka’s Law, which would make it a criminal offence for people working with vulnerable children to not report suspicions of abuse.